EZ cap bottles are great for bottling beer, wine, cider, mead, kombucha...just about anything! The grolsch-style swing top caps lock in place with the aid of a gasket to create an airtight seal. These will keep your product fresh and well carbonated. They are reusable too. Only the gaskets need to be changed out, and only occasionally. The blue EZ Cap bottles are a beautiful shade of dark blue and are very decorative and are often used in more artistic forays.